US20140144624A1 - Electric motors and related systems for deployment in a downhole well environment - Google Patents
Electric motors and related systems for deployment in a downhole well environment Download PDFInfo
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- US20140144624A1 US20140144624A1 US14/082,127 US201314082127A US2014144624A1 US 20140144624 A1 US20140144624 A1 US 20140144624A1 US 201314082127 A US201314082127 A US 201314082127A US 2014144624 A1 US2014144624 A1 US 2014144624A1
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- 238000000034 method Methods 0.000 claims abstract description 20
- 239000012530 fluid Substances 0.000 claims abstract description 17
- 238000005086 pumping Methods 0.000 claims abstract description 5
- 230000000903 blocking effect Effects 0.000 claims abstract 5
- 230000008878 coupling Effects 0.000 claims 2
- 238000010168 coupling process Methods 0.000 claims 2
- 238000005859 coupling reaction Methods 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 description 23
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
- H02K33/16—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with polarised armatures moving in alternate directions by reversal or energisation of a single coil system
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/128—Adaptation of pump systems with down-hole electric drives
Definitions
- the present application relates to the oil field industry and more specifically to motors that supply output to an operable production device in a well, such as for example a pump, sleeve, valve or other mechanical device.
- an operable production device in a well such as for example a pump, sleeve, valve or other mechanical device.
- the disclosures provided herein can be particularly useful in small-bore applications.
- the present disclosure provides improved electric motor configurations for deployment in a downhole well environment.
- the unique configurations employ linear reciprocating movement of a series of aligned magnets including one or more movable magnets in combination with one or more stationary magnets. This advantageously provides raw linear output, while taking up relatively little annular space in the well. This technology is thus especially suitable for use in small wellbores where other artificial lift methods are difficult to implement.
- two groups of magnets are interdigitated and have opposing faces. Reversing the polarity of one of the groups of magnets causes reciprocation of the movable magnet(s) and provides linear output to the noted production device.
- the groups of magnets are aligned adjacent each other and the movable magnet(s) is/are movable axially between a first position proximate the outer end of one of the stationary magnets and a second position proximate the outer end of another of the stationary magnets. Reversing the polarity of one of the groups of magnets causes reciprocation of the movable magnet(s) and provides the linear output to the production device.
- the magnets can be, for example, disc-shaped or rod-shaped.
- one example of the electric motor includes a housing containing a series of magnets.
- the series includes at least three magnets, including two outer magnets and an inner magnet disposed between the two outer magnets.
- the two outer magnets have inside faces with like poles and outside faces with like poles.
- One of the inner magnet and the two outer magnets is stationary, while the other is movable.
- the one of the inner magnet and the two outer magnets that is movable moves between a first position in which the inner magnet is located proximate to one of the outer two magnets, and a second position in which the inner magnet is located proximate to the other of the two outer magnets.
- the one of the inner magnet and the two outer magnets that is movable is configured for connection to an operable production device.
- a supply of alternating current is coupled to the series of magnets so as to alternate the polarity of one of the inner magnet and the two outer magnets to thereby cause the one of the inner magnet and the two outer magnets that is movable to reciprocate between the first and second positions, and to thereby provide reciprocating linear output to drive the operable production device.
- the electric motor includes a housing containing a plurality of aligned magnets.
- the plurality of magnets includes at least two adjacent, axially-aligned stationary magnets having outer ends having the same polarity and inner ends having the same polarity.
- the plurality of magnets also includes at least one movable magnet disposed adjacent to, or more specifically, within the stationary magnets.
- the movable magnet is movable axially between a first position proximate the outer end of one of the stationary magnets and a second position proximate the outer end of the other stationary magnet.
- the movable magnet is configured for connection to an operable production device in the well.
- a supply of alternating current is coupled to the plurality of magnets so as to alternate the polarity of one of the movable and stationary magnets to thereby cause the movable magnet to reciprocate between the first and second positions, and to thereby provide reciprocating linear output to drive the operable production device.
- Downhole well pumping systems for artificial lift are also provided.
- the systems include a production pump disposed in a downhole well environment and an electric motor coupled to the production pump and operable to provide reciprocating linear output to drive the production pump.
- the configuration of the electric motor can be that of either of the two examples described above.
- a controller is configured to control operation of the electric motor by selectively supplying alternating current to the electric motor and to thereby provide reciprocating linear output to drive the operable production device.
- FIG. 1 depicts a downhole well pumping system according to one example of the present disclosure.
- FIG. 2 depicts one example of an electric motor according to the present disclosure for deployment in a downhole well environment, wherein two inner magnets that are movable are positioned in a first position.
- FIG. 3 depicts the example shown in FIG. 2 , wherein the inner magnets are positioned in a second position.
- FIG. 4 depicts another example of an electric motor according to the present disclosure, wherein a series of magnets are disc-shaped.
- FIG. 5 depicts another example of an electric motor according to the present disclosure, wherein a series of magnets are rod-shaped.
- FIG. 6 depicts another example of an electric motor according to the present disclosure, wherein a movable magnet is moved into a first position proximate an outer end of one of two adjacent, axially-aligned stationary magnets.
- FIG. 7 depicts the example in FIG. 6 wherein the movable magnet is positioned in a second position proximate the outer end of the other of the two adjacent, axially-aligned stationary magnets.
- FIG. 8 depicts the example in FIG. 2 wherein the two inner magnets that are movable are connected to a spring.
- FIG. 1 depicts a well 11 that extends from a surface 14 into an underground or downhole well environment in a reservoir 12 .
- the well 11 can be of any length and in the preferred example is a small-bore application.
- the well 11 has a vertical orientation; however, the well 11 can also or alternately extend at an angle or horizontal to the surface 14 .
- FIG. 1 also depicts an example of a system 10 according to the present disclosure.
- System 10 includes a controller 16 , an electric motor 18 , and related operable production device 20 .
- the controller 16 preferably includes a memory and a programmable code which can be executed to control operation of the electric motor 18 , such as for example to operate a source of power 17 to selectively supply alternating current to the electric motor 18 and to thereby provide a reciprocating linear output to the operable production device 20 , as described further herein below.
- the controller 16 is located at the surface 14 and is communicatively attached to the source of power 17 and to the electric motor 18 via wired or wireless links 19 , 21 . This arrangement advantageously requires a minimal surface footprint.
- the controller 16 could be attached directly to the motor 18 or to, for example, other related operating equipment.
- the electric motor 18 is coupled to the operable production device 20 and is configured to provide the noted reciprocating linear output to drive the operable production device 20 .
- the operable production device 20 is a pump, such as a piston pump or a diaphragm or bag (bellows) pump; however it could comprise any other downhole mechanical device capable of receiving input from the motor 18 .
- FIG. 2 depicts one example of the electric motor 18 according to the present disclosure.
- an electric motor 18 a includes a housing 32 containing a series of magnets 23 aligned along an axial direction (A).
- the housing 32 serves as a mechanical support for the series of magnets 23 and as a path for magnetic flux, as will be described herein below.
- the series of magnets 23 includes a first group of magnets (“outer magnets”) 26 a, 26 b, and 26 c and a second group of magnets (“inner magnets”) 28 a, 28 b disposed between the first group of magnets 26 a - 26 c in an interdigitated configuration.
- the faces of the magnets 26 a, 26 b and 26 c are aligned so as to have poles that are not all oriented the same in the axial direction. Rather, the poles at the opposing faces of the two magnets 26 a, 26 b are both south and the poles at the respective opposite faces of the magnets 26 a, 26 b are both north. In the same way, the poles at the opposing faces of the two magnets 26 b, 26 c are both north and the poles at the respective opposite faces of the magnets 26 b, 26 c are both south.
- the faces of the magnets 28 a, 28 b are also aligned so as to have poles that are not oriented the same in the axial direction.
- the poles at the opposing faces of the magnets 28 a, 28 b are both north, while the poles at the opposite faces of the magnets 28 a, 28 b are both south.
- the magnet 28 a is aligned such that it is attracted to one of the opposing faces of the two magnets 26 a, 26 b and repelled from the other.
- the magnet 28 b is aligned such that it is attracted to one of the opposing faces of the two magnets 26 b, 26 c and repelled from the other.
- the magnets 26 a - 26 c and 28 a, 28 b are electromagnets; however, other types of magnets may be employed.
- the magnets 26 a - 26 c are stationary magnets, while the magnets 28 a, 28 b are movable magnets.
- the outer magnets 26 a - 26 c are fixed in relation to the housing 32 and thus remain stationary relative to the housing 32 .
- the inner magnets 28 a, 28 b are movable in the axial direction (A) and movable relative to the outer magnets 26 a - 26 c between first and second positions shown in FIGS. 2 and 3 , respectively. It is only necessary that one of the groups of magnets 28 a, 28 b or 26 a - 26 c remain stationary, while the other is movable between the first and second positions shown in FIGS. 2 and 3 , respectively.
- the outer magnets 26 a - 26 c could be movable, whereas the inner magnets 28 a, 28 b could remain stationary. It is also possible to construct the motor 18 a with fewer or more magnets in each group.
- the housing 32 could contain a series of magnets including only two outer magnets (e.g. 26 a, 26 b ) and an inner magnet (e.g. 28 a ) disposed between the two outer magnets, wherein the two outer magnets have opposing faces with like poles and opposite faces with like poles.
- either of the two groups of magnets could be movable and connected to the device 20 , with the other remaining stationary.
- the movable magnet 28 a is connected to the movable magnet 28 b by a connector shaft 30 b.
- Another connector shaft 30 a connects the movable magnet 28 a and the movable magnet 28 b to the operable production device 20 (schematically shown in dashed lines) in such a manner that movement of the magnets 28 a, 28 b is conveyed to the operable production device 20 .
- Another connector shaft 30 c is also provided and is optionally removably connected to another series of magnets 31 (schematically shown in dashed lines) to increase or decrease productive output of the motor 18 .
- the amount of linear output provided to the device 20 can be easily increased by adding additional series of magnets 31 to the motor 18 a in a stacked formation and easily decreased by subtracting additional series of magnets 31 from the formation.
- the three connector shafts 30 a - 30 c are separate, but could alternately be replaced with a single connector shaft extending through and/or around the various magnets in the series 23 .
- FIG. 8 depicts the electric motor 18 a, wherein a spring 34 has been introduced into the series 23 .
- the movable magnets 28 a, 28 b are connected to the spring 34 by the connector shaft 30 c.
- the spring 34 is aligned such that it shortens and lengthens in the axial direction (A).
- One end of the spring 34 is connected to the connector shaft 30 c, while the other end of the spring 34 is connected to the housing 32 .
- the housing 32 has an aperture 33 which allows the connector shaft 30 c to move through the housing 32 .
- the spring can be used to increase the usable linear output of the motor 18 a by smoothing the quadratic response created as the movable magnets move towards or away from the stationary magnets.
- the spring can also be used to pre-load the series of magnets 23 to increase the linear output in one direction, while decreasing it in the other direction.
- the source of power 17 is connected to the stationary outer magnets 26 a - 26 c by a wired link 21 , preferably wired through the housing 32 , to provide a supply of alternating current to the magnets 26 a - 26 c and to thereby cause the poles of the magnets 26 a - 26 c to alternate between the orientation in which the opposing faces of 26 a, 26 b have like south poles and the opposing faces of 26 b, 26 c have like north poles (shown in FIG. 2 ), and the orientation in which the opposing faces of 26 a, 26 b have like north poles and the opposing faces of 26 b, 26 c have like south poles (shown in FIG. 3 ).
- FIG. 2 depicts the magnet 28 a moved into a first position wherein the magnet 28 a has a south-north pole orientation in the axial direction (A). The north pole of the magnet 28 a is attracted to the south pole of the magnet 26 b.
- the source of power 17 could be connected to the movable magnets 28 a, 28 b to alternate their polarity but not the polarity of the stationary magnets 26 a - 26 c, and to thereby cause the same reciprocation of the magnets 28 a, 28 b described above. It is to be understood that the three magnets 26 a - 26 c could be movable, while the magnets 28 a, 28 b could be stationary. The polarity of either the magnets 28 a, 28 b or the magnets 26 a - 26 c could be alternated in this configuration as well to provide reciprocating linear output to the operable production device 20 .
- FIGS. 2 and 3 the configuration in FIGS. 2 and 3 is shown as an example only, and that the same reciprocating linear motion could be created by any combination of at least three magnets: two outer magnets and one inner magnet disposed between the outer magnets, one of the inner magnet and the two outer magnets being stationary and the other being movable between the first and second positions.
- This disclosure therefore also contemplates combinations of four magnets, five magnets, six magnets, and so on.
- the electric motor 18 a may have various geometries, examples of which are shown in FIGS. 4 and 5 .
- FIG. 4 shows a variation of the electric motor 18 a, which uses disc-shaped outer magnets 38 and disc shaped inner magnets 40 .
- FIG. 5 shows another variation of the electric motor 18 a, which uses rod-shaped outer magnets 42 and rod-shaped inner magnets 44 .
- Both the disc-shaped magnets 40 and the rod-shaped magnets 44 are capable of moving between the first and second positions as shown in FIGS. 2 and 3 , respectively.
- the geometry of the magnets can be varied as shown in FIGS. 4 and 5 for different applications.
- the rod-shaped magnets 42 , 44 are particularly useful in small-bore applications due to their small diameter.
- FIG. 6 depicts another example of the electric motor 18 according to the present disclosure.
- an electric motor 18 b includes a housing 52 containing a plurality of aligned magnets 53 which includes at least two adjacent, stationary magnets 48 and at least one movable magnet 50 disposed adjacent to the stationary magnets 48 a, 48 b.
- the stationary magnets 48 a, 48 b are coupled to the housing 52 and are coils having outer ends with the same polarity and inner ends with the same polarity; in the example shown in FIG. 6 , the outer ends of stationary magnets 48 a, 48 b are south poles, while the inner ends of stationary magnets 48 a, 48 b are north poles.
- the movable magnet 50 is disposed adjacent to the stationary magnets 48 a, 48 b. In the example shown, the movable magnet 50 is disposed in a through-going aperture 54 , defined by the stationary magnets 48 a, 48 b.
- the movable magnet 50 is connected to a connector shaft 60 a, 60 b on either end.
- Connector shaft 60 a connects the movable magnet 50 to the operable production device 20 in such a manner that movement of the movable magnet 50 is conveyed to the operable production device 20 (schematically shown in dashed lines).
- the other connector shaft 60 b is optionally removably connected to another movable magnet 51 (schematically shown in dashed lines) to increase or decrease reciprocating linear output of the motor 18 b.
- the amount of linear output provided to the device 20 can be easily increased by adding additional pluralities of aligned magnets 53 to the motor 18 b in an axially stacked formation and also can be easily decreased by subtracting pluralities of magnets 53 from the formation.
- the two connector shafts 60 a, 60 b are separate, but could alternately be replaced with a single shaft extending through and/or around the movable magnet 50 .
- the movable magnet 50 is a permanent magnet
- the stationary magnets 48 a, 48 b are electromagnets; however, other combinations of permanent and electromagnets may be employed.
- the movable magnet 50 and connector shafts 60 a, 60 b are configured such that they substantially block any fluid from flowing through the through-going aperture 54 .
- This provides an advantage over the prior art, in which fluid can come into direct contact with the magnets in the housing and the magnets connected to the shaft. Fluids pumped from wells often contain small metallic pieces that stick to permanent magnets in the motor, and eventually clog the motor. By preventing fluid from flowing through the through-going aperture 54 , this will not occur.
- the source of power 17 is connected to the stationary magnets 48 a, 48 b by a wired link 21 to provide a supply of alternating current to the magnets 48 a, 48 b and to thereby cause the poles of the magnets 48 a, 48 b to alternate between the orientation in which the inner ends of the stationary magnets 48 a, 48 b are north poles (shown in FIG. 6 ) and the orientation in which the inner ends of the stationary magnets 48 a, 48 b are south poles (shown in FIG. 7 ). Alternating the north-south orientation of the magnets 48 a, 48 b causes the movable magnet 50 to reciprocate back and forth between the noted first and second positions shown in FIGS. 6 and 7 , respectively.
- FIG. 6 depicts the movable magnet 50 in a first position wherein the movable magnet 50 has a north-south pole orientation.
- the south pole of the movable magnet 50 is attracted toward the south pole of the stationary magnet 48 b such that, if it were allowed to continue moving, the south poles of the movable magnet 50 and the stationary magnet 48 b would be aligned, and the net magnetic force on either magnet 50 or 48 b would be zero.
- a physical stop 62 or a position sensor prevents the movable magnet 50 from completely aligning its poles with those of the stationary magnet 48 b.
- the movable magnet 50 attempts to align its north and south poles with the north and south poles of the stationary magnet 48 a so as to cancel out the net force on either magnet 50 or 48 a. Once again however, this is prevented by a physical stop 62 or a position sensor (not shown).
- the movable magnet 50 again attempts to align with the stationary magnet 48 b.
- the movable magnet 50 reciprocates back and forth between the noted first position ( FIG. 6 ) and the noted second position ( FIG. 7 ).
- the source of power 17 is connected to the movable magnet 50 by a wired link 21 to alternate the polarity of the movable magnet 50 and thereby cause the same reciprocation of the movable magnet 50 as described above.
- this is not preferable because providing power to the movable magnet 50 would require that the wired link 21 reciprocate along with the movable magnet 50 . Over time, this causes the wired link 21 to wear out, necessitating repair of the electric motor 18 . Therefore, it is preferable that the movable magnet 50 be a permanent magnet, which does not require a wired link 21 to supply it with power.
Abstract
A method can include providing a motor that includes a housing, axially aligned stationary electromagnets disposed in the housing, an aperture defined by the axially aligned stationary electromagnets, movable axially aligned permanent magnets disposed in the aperture and a connector shaft connected at an end of the movable axially aligned permanent magnets; disposing the motor and a rod pump in a well; controlling operation of the motor to linearly reciprocate the axially aligned movable permanent magnets and the connector shaft; pumping fluid from the well via the rod pump responsive to the linear reciprocation of the axially aligned movable permanent magnets and the connector shaft; and substantially blocking the pumped fluid from flowing through the aperture defined by the axially aligned stationary electromagnets of the motor. Various other apparatuses, systems, methods, etc., are also disclosed.
Description
- This application is a continuation of a co-pending U.S. patent application having Ser. No. 12/572,548, filed 2 Oct. 2009, now U.S. Pat. No. 8,587,163, issued 19 Nov. 2013, which are incorporated by reference herein.
- The present application relates to the oil field industry and more specifically to motors that supply output to an operable production device in a well, such as for example a pump, sleeve, valve or other mechanical device. The disclosures provided herein can be particularly useful in small-bore applications.
- Artificial lift in wells can be achieved by the use of downhole electric motors that convert rotational motion to linear motion, or by the use of surface-bound rod pumps. Electric motors typically employ magnetic forces to create rotational motion, which is then converted to linear motion in order to provide output to an operable production device, such as a pump or other mechanical device. The conversion of rotational motion to linear motion involves failure-prone mechanisms and complex moving parts, which disadvantageously introduce efficiency and/or reliability losses to the system. This rotational-to-linear conversion is also impractical in special small-bore applications, where space constraints limit the size of the motor and therefore its output capabilities. Current non-rotational artificial lift methods, such as rod pumps, disadvantageously require surface motors and extensive shafting to couple a source of power to a downhole linear pump. These methods are not a viable option in areas where above-ground space is at a premium.
- The present disclosure provides improved electric motor configurations for deployment in a downhole well environment. The unique configurations employ linear reciprocating movement of a series of aligned magnets including one or more movable magnets in combination with one or more stationary magnets. This advantageously provides raw linear output, while taking up relatively little annular space in the well. This technology is thus especially suitable for use in small wellbores where other artificial lift methods are difficult to implement.
- In one example, two groups of magnets are interdigitated and have opposing faces. Reversing the polarity of one of the groups of magnets causes reciprocation of the movable magnet(s) and provides linear output to the noted production device. In another example, the groups of magnets are aligned adjacent each other and the movable magnet(s) is/are movable axially between a first position proximate the outer end of one of the stationary magnets and a second position proximate the outer end of another of the stationary magnets. Reversing the polarity of one of the groups of magnets causes reciprocation of the movable magnet(s) and provides the linear output to the production device. The magnets can be, for example, disc-shaped or rod-shaped.
- In broader terms, one example of the electric motor includes a housing containing a series of magnets. The series includes at least three magnets, including two outer magnets and an inner magnet disposed between the two outer magnets. The two outer magnets have inside faces with like poles and outside faces with like poles. One of the inner magnet and the two outer magnets is stationary, while the other is movable. The one of the inner magnet and the two outer magnets that is movable moves between a first position in which the inner magnet is located proximate to one of the outer two magnets, and a second position in which the inner magnet is located proximate to the other of the two outer magnets. The one of the inner magnet and the two outer magnets that is movable is configured for connection to an operable production device. A supply of alternating current is coupled to the series of magnets so as to alternate the polarity of one of the inner magnet and the two outer magnets to thereby cause the one of the inner magnet and the two outer magnets that is movable to reciprocate between the first and second positions, and to thereby provide reciprocating linear output to drive the operable production device.
- Another example of the electric motor includes a housing containing a plurality of aligned magnets. The plurality of magnets includes at least two adjacent, axially-aligned stationary magnets having outer ends having the same polarity and inner ends having the same polarity. The plurality of magnets also includes at least one movable magnet disposed adjacent to, or more specifically, within the stationary magnets. The movable magnet is movable axially between a first position proximate the outer end of one of the stationary magnets and a second position proximate the outer end of the other stationary magnet. The movable magnet is configured for connection to an operable production device in the well. A supply of alternating current is coupled to the plurality of magnets so as to alternate the polarity of one of the movable and stationary magnets to thereby cause the movable magnet to reciprocate between the first and second positions, and to thereby provide reciprocating linear output to drive the operable production device.
- Downhole well pumping systems for artificial lift are also provided. The systems include a production pump disposed in a downhole well environment and an electric motor coupled to the production pump and operable to provide reciprocating linear output to drive the production pump. The configuration of the electric motor can be that of either of the two examples described above. A controller is configured to control operation of the electric motor by selectively supplying alternating current to the electric motor and to thereby provide reciprocating linear output to drive the operable production device.
- A best mode is described herein below with reference to the following drawing figures.
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FIG. 1 depicts a downhole well pumping system according to one example of the present disclosure. -
FIG. 2 depicts one example of an electric motor according to the present disclosure for deployment in a downhole well environment, wherein two inner magnets that are movable are positioned in a first position. -
FIG. 3 depicts the example shown inFIG. 2 , wherein the inner magnets are positioned in a second position. -
FIG. 4 depicts another example of an electric motor according to the present disclosure, wherein a series of magnets are disc-shaped. -
FIG. 5 depicts another example of an electric motor according to the present disclosure, wherein a series of magnets are rod-shaped. -
FIG. 6 depicts another example of an electric motor according to the present disclosure, wherein a movable magnet is moved into a first position proximate an outer end of one of two adjacent, axially-aligned stationary magnets. -
FIG. 7 depicts the example inFIG. 6 wherein the movable magnet is positioned in a second position proximate the outer end of the other of the two adjacent, axially-aligned stationary magnets. -
FIG. 8 depicts the example inFIG. 2 wherein the two inner magnets that are movable are connected to a spring. - In the following description, certain terms have been used for brevity, clearness, and understanding. No unnecessary limitations are to be implied therefrom beyond the requirement of the prior art because such terms are used for descriptive purposes and are intended to be broadly construed. The different configurations described herein may be used alone or in combination with other configurations and systems. Various equivalents, alternatives, and modifications are possible within the scope of the appended claims.
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FIG. 1 depicts awell 11 that extends from asurface 14 into an underground or downhole well environment in areservoir 12. Thewell 11 can be of any length and in the preferred example is a small-bore application. In the example shown, thewell 11 has a vertical orientation; however, thewell 11 can also or alternately extend at an angle or horizontal to thesurface 14. -
FIG. 1 also depicts an example of asystem 10 according to the present disclosure.System 10 includes acontroller 16, an electric motor 18, and relatedoperable production device 20. Thecontroller 16 preferably includes a memory and a programmable code which can be executed to control operation of the electric motor 18, such as for example to operate a source ofpower 17 to selectively supply alternating current to the electric motor 18 and to thereby provide a reciprocating linear output to theoperable production device 20, as described further herein below. In the example shown, thecontroller 16 is located at thesurface 14 and is communicatively attached to the source ofpower 17 and to the electric motor 18 via wired orwireless links controller 16 could be attached directly to the motor 18 or to, for example, other related operating equipment. The electric motor 18 is coupled to theoperable production device 20 and is configured to provide the noted reciprocating linear output to drive theoperable production device 20. In the example shown, theoperable production device 20 is a pump, such as a piston pump or a diaphragm or bag (bellows) pump; however it could comprise any other downhole mechanical device capable of receiving input from the motor 18. -
FIG. 2 depicts one example of the electric motor 18 according to the present disclosure. In this example, anelectric motor 18 a includes ahousing 32 containing a series ofmagnets 23 aligned along an axial direction (A). Thehousing 32 serves as a mechanical support for the series ofmagnets 23 and as a path for magnetic flux, as will be described herein below. The series ofmagnets 23 includes a first group of magnets (“outer magnets”) 26 a, 26 b, and 26 c and a second group of magnets (“inner magnets”) 28 a, 28 b disposed between the first group of magnets 26 a-26 c in an interdigitated configuration. The faces of themagnets magnets magnets magnets magnets magnets magnets magnets magnet 28 a is aligned such that it is attracted to one of the opposing faces of the twomagnets magnet 28 b is aligned such that it is attracted to one of the opposing faces of the twomagnets - In the example shown, the magnets 26 a-26 c are stationary magnets, while the
magnets housing 32 and thus remain stationary relative to thehousing 32. In contrast, theinner magnets FIGS. 2 and 3 , respectively. It is only necessary that one of the groups ofmagnets FIGS. 2 and 3 , respectively. In other words, the outer magnets 26 a-26 c could be movable, whereas theinner magnets motor 18 a with fewer or more magnets in each group. For example, thehousing 32 could contain a series of magnets including only two outer magnets (e.g. 26 a, 26 b) and an inner magnet (e.g. 28 a) disposed between the two outer magnets, wherein the two outer magnets have opposing faces with like poles and opposite faces with like poles. In this example, either of the two groups of magnets could be movable and connected to thedevice 20, with the other remaining stationary. - In the example shown, the
movable magnet 28 a is connected to themovable magnet 28 b by aconnector shaft 30 b. Anotherconnector shaft 30 a connects themovable magnet 28 a and themovable magnet 28 b to the operable production device 20 (schematically shown in dashed lines) in such a manner that movement of themagnets operable production device 20. Anotherconnector shaft 30 c is also provided and is optionally removably connected to another series of magnets 31 (schematically shown in dashed lines) to increase or decrease productive output of the motor 18. In this unique modular design, the amount of linear output provided to thedevice 20 can be easily increased by adding additional series ofmagnets 31 to themotor 18 a in a stacked formation and easily decreased by subtracting additional series ofmagnets 31 from the formation. The three connector shafts 30 a-30 c are separate, but could alternately be replaced with a single connector shaft extending through and/or around the various magnets in theseries 23. -
FIG. 8 depicts theelectric motor 18 a, wherein aspring 34 has been introduced into theseries 23. Themovable magnets spring 34 by theconnector shaft 30 c. Thespring 34 is aligned such that it shortens and lengthens in the axial direction (A). One end of thespring 34 is connected to theconnector shaft 30 c, while the other end of thespring 34 is connected to thehousing 32. Thehousing 32 has anaperture 33 which allows theconnector shaft 30 c to move through thehousing 32. The spring can be used to increase the usable linear output of themotor 18 a by smoothing the quadratic response created as the movable magnets move towards or away from the stationary magnets. The spring can also be used to pre-load the series ofmagnets 23 to increase the linear output in one direction, while decreasing it in the other direction. - In the example shown, the source of
power 17 is connected to the stationary outer magnets 26 a-26 c by awired link 21, preferably wired through thehousing 32, to provide a supply of alternating current to the magnets 26 a-26 c and to thereby cause the poles of the magnets 26 a-26 c to alternate between the orientation in which the opposing faces of 26 a, 26 b have like south poles and the opposing faces of 26 b, 26 c have like north poles (shown inFIG. 2 ), and the orientation in which the opposing faces of 26 a, 26 b have like north poles and the opposing faces of 26 b, 26 c have like south poles (shown inFIG. 3 ). Alternating the polarity of themagnets magnet 28 a to reciprocate back and forth between the noted first and second positions shown inFIGS. 2 and 3 respectively, while alternating the polarity of themagnets magnet 28 b to reciprocate back and forth between the noted first and second positions. More specifically,FIG. 2 depicts themagnet 28 a moved into a first position wherein themagnet 28 a has a south-north pole orientation in the axial direction (A). The north pole of themagnet 28 a is attracted to the south pole of themagnet 26 b. When the current is alternated and the pole orientation of themagnets magnet 28 a repels from the north pole of themagnet 26 b, while the south pole of themagnet 28 a attracts to the north pole of themagnet 26 a. Thus, themagnet 28 a moves from the first position shown inFIG. 2 to the second position shown inFIG. 3 . When the current is alternated once again and the opposing faces of themagnets magnet 28 a will again move to the first position shown inFIG. 2 , where its north pole will be attracted to the south pole of themagnet 26 b, while its south pole will be repelled from the south pole of themagnet 26 a. The same repulsion and attraction occurs betweenmagnets FIG. 2 , the south pole of themagnet 28 b is attracted to the north pole of themagnet 26 c. When the current is alternated and the pole orientation of themagnets magnet 28 b repels from the south pole of themagnet 26 c, while the north pole of themagnet 28 b attracts to the south pole of themagnet 26 b. Thus, themagnet 28 b moves from the first position shown inFIG. 2 to the second position shown inFIG. 3 . When the current is alternated once again and the opposing faces of theouter magnets magnet 28 b will again move to the first position shown inFIG. 2 , where its south pole will be attracted to the north pole of themagnet 26 c, while its north pole will be repelled from the north pole of themagnet 26 b. - Providing alternating current to alternate the polarity of the outer magnets 26 a-26 c thereby causes the
inner magnets FIG. 1 ) and the noted second position (FIG. 2 ) and in turn to provide linear output to theproduction device 20. - In another example, the source of
power 17 could be connected to themovable magnets magnets magnets magnets operable production device 20. - It is also to be understood that the configuration in
FIGS. 2 and 3 is shown as an example only, and that the same reciprocating linear motion could be created by any combination of at least three magnets: two outer magnets and one inner magnet disposed between the outer magnets, one of the inner magnet and the two outer magnets being stationary and the other being movable between the first and second positions. This disclosure therefore also contemplates combinations of four magnets, five magnets, six magnets, and so on. - The
electric motor 18 a may have various geometries, examples of which are shown inFIGS. 4 and 5 .FIG. 4 shows a variation of theelectric motor 18 a, which uses disc-shapedouter magnets 38 and disc shapedinner magnets 40.FIG. 5 shows another variation of theelectric motor 18 a, which uses rod-shapedouter magnets 42 and rod-shapedinner magnets 44. Both the disc-shapedmagnets 40 and the rod-shapedmagnets 44 are capable of moving between the first and second positions as shown inFIGS. 2 and 3 , respectively. The geometry of the magnets can be varied as shown inFIGS. 4 and 5 for different applications. For example, the rod-shapedmagnets -
FIG. 6 depicts another example of the electric motor 18 according to the present disclosure. Specifically, anelectric motor 18 b includes ahousing 52 containing a plurality of alignedmagnets 53 which includes at least two adjacent, stationary magnets 48 and at least onemovable magnet 50 disposed adjacent to thestationary magnets stationary magnets housing 52 and are coils having outer ends with the same polarity and inner ends with the same polarity; in the example shown inFIG. 6 , the outer ends ofstationary magnets stationary magnets movable magnet 50 is disposed adjacent to thestationary magnets movable magnet 50 is disposed in a through-goingaperture 54, defined by thestationary magnets movable magnet 50 is connected to aconnector shaft 60 a, 60 b on either end.Connector shaft 60 a connects themovable magnet 50 to theoperable production device 20 in such a manner that movement of themovable magnet 50 is conveyed to the operable production device 20 (schematically shown in dashed lines). The other connector shaft 60 b is optionally removably connected to another movable magnet 51 (schematically shown in dashed lines) to increase or decrease reciprocating linear output of themotor 18 b. In this unique modular design, the amount of linear output provided to thedevice 20 can be easily increased by adding additional pluralities of alignedmagnets 53 to themotor 18 b in an axially stacked formation and also can be easily decreased by subtracting pluralities ofmagnets 53 from the formation. The twoconnector shafts 60 a, 60 b are separate, but could alternately be replaced with a single shaft extending through and/or around themovable magnet 50. Preferably themovable magnet 50 is a permanent magnet, while thestationary magnets - The
movable magnet 50 andconnector shafts 60 a, 60 b are configured such that they substantially block any fluid from flowing through the through-goingaperture 54. This provides an advantage over the prior art, in which fluid can come into direct contact with the magnets in the housing and the magnets connected to the shaft. Fluids pumped from wells often contain small metallic pieces that stick to permanent magnets in the motor, and eventually clog the motor. By preventing fluid from flowing through the through-goingaperture 54, this will not occur. - In the example shown, the source of
power 17 is connected to thestationary magnets wired link 21 to provide a supply of alternating current to themagnets magnets stationary magnets FIG. 6 ) and the orientation in which the inner ends of thestationary magnets FIG. 7 ). Alternating the north-south orientation of themagnets movable magnet 50 to reciprocate back and forth between the noted first and second positions shown inFIGS. 6 and 7 , respectively. Specifically,FIG. 6 depicts themovable magnet 50 in a first position wherein themovable magnet 50 has a north-south pole orientation. The south pole of themovable magnet 50 is attracted toward the south pole of thestationary magnet 48 b such that, if it were allowed to continue moving, the south poles of themovable magnet 50 and thestationary magnet 48 b would be aligned, and the net magnetic force on eithermagnet physical stop 62 or a position sensor (not shown) prevents themovable magnet 50 from completely aligning its poles with those of thestationary magnet 48 b. When the current is alternated and the pole orientation of thestationary magnets stationary magnets FIG. 7 ), themovable magnet 50 attempts to align its north and south poles with the north and south poles of thestationary magnet 48 a so as to cancel out the net force on eithermagnet physical stop 62 or a position sensor (not shown). When the current is again alternated to create the pole orientation shown inFIG. 6 , themovable magnet 50 again attempts to align with thestationary magnet 48 b. Thus themovable magnet 50 reciprocates back and forth between the noted first position (FIG. 6 ) and the noted second position (FIG. 7 ). - In another example, the source of
power 17 is connected to themovable magnet 50 by awired link 21 to alternate the polarity of themovable magnet 50 and thereby cause the same reciprocation of themovable magnet 50 as described above. However, this is not preferable because providing power to themovable magnet 50 would require that thewired link 21 reciprocate along with themovable magnet 50. Over time, this causes thewired link 21 to wear out, necessitating repair of the electric motor 18. Therefore, it is preferable that themovable magnet 50 be a permanent magnet, which does not require awired link 21 to supply it with power.
Claims (15)
1. A method comprising:
providing a controller;
providing a rod pump;
providing a motor that comprises a housing, axially aligned stationary electromagnets disposed in the housing, an aperture defined by the axially aligned stationary electromagnets, movable axially aligned permanent magnets disposed in the aperture and a connector shaft connected at an end of the movable axially aligned permanent magnets;
coupling the motor to the rod pump via the connector shaft;
disposing the motor and the rod pump in a well;
controlling operation of the motor by selectively supplying alternating current to the axially aligned stationary electromagnets via a power source controlled by the controller to linearly reciprocate the axially aligned movable permanent magnets and the connector shaft;
pumping fluid from the well via the rod pump responsive to the linear reciprocation of the axially aligned movable permanent magnets and the connector shaft; and
substantially blocking the pumped fluid from flowing through the aperture defined by the axially aligned stationary electromagnets of the motor.
2. The method of claim 1 comprising providing a position sensor and sensing position of the axially aligned movable permanent magnets.
3. The method of claim 1 further comprising providing another connector shaft at the other end of the axially aligned permanent magnets and connecting another moveable permanent magnet to the axially aligned permanent magnets via the other connector shaft.
4. The method of claim 1 wherein the well extends from a surface into a well environment and wherein the disposing the motor and the rod pump in the well comprises disposing the motor and the rod pump horizontally with respect to the surface.
5. The method of claim 1 wherein the controller comprises a memory and programmable code wherein the programmable code is executable for controlling operation of the motor.
6. The method of claim 1 wherein the controller is provided at a surface and is communicatively attached to a source of power via a wired link.
7. The method of claim 1 wherein the controller is provided at a surface and is communicatively attached to a source of power via a wireless link.
8. The method of claim 1 wherein the controller is attached directly to the motor.
9. The method of claim 1 wherein the connector shaft comprises an annular component for substantially blocking the pumped fluid from flowing through the aperture defined by the axially aligned stationary electromagnets of the motor.
10. The method of claim 1 wherein the substantially blocking the pumped fluid from flowing through the aperture defined by the axially aligned stationary electromagnets of the motor prevents clogging of the axially aligned permanent magnets disposed in the aperture defined by the axially aligned stationary electromagnets of the motor.
11. The method of claim 1 wherein the pumped fluid comprises a fluid from a reservoir.
12. A method comprising:
providing a controller;
providing a rod pump;
providing a motor that comprises a housing, axially aligned stationary electromagnets disposed in the housing, an aperture defined by the axially aligned stationary electromagnets, movable axially aligned permanent magnets disposed in the aperture and a connector shaft connected at an end of the movable axially aligned permanent magnets;
coupling the motor to the rod pump via the connector shaft;
disposing the motor and the rod pump in a well;
controlling operation of the motor by selectively supplying alternating current to the axially aligned stationary electromagnets via a power source controlled by the controller to linearly reciprocate the axially aligned movable permanent magnets and the connector shaft;
pumping fluid from the well via the rod pump responsive to the linear reciprocation of the axially aligned movable permanent magnets and the connector shaft; and
preventing clogging of the axially aligned permanent magnets disposed in the aperture defined by the axially aligned stationary electromagnets of the motor by substantially blocking the pumped fluid from flowing through the aperture defined by the axially aligned stationary electromagnets of the motor.
13. The method of claim 12 wherein the pumped fluid comprises metallic pieces.
14. The method of claim 13 wherein the metallic pieces are attracted to a magnet.
15. The method of claim 12 wherein the pumped fluid comprises a fluid from a reservoir.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/082,127 US20140144624A1 (en) | 2009-10-02 | 2013-11-16 | Electric motors and related systems for deployment in a downhole well environment |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/572,548 US8587163B2 (en) | 2009-10-02 | 2009-10-02 | Electric motors and related systems for deployment in a downhole well environment |
US14/082,127 US20140144624A1 (en) | 2009-10-02 | 2013-11-16 | Electric motors and related systems for deployment in a downhole well environment |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/572,548 Continuation US8587163B2 (en) | 2009-10-02 | 2009-10-02 | Electric motors and related systems for deployment in a downhole well environment |
Publications (1)
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US20140144624A1 true US20140144624A1 (en) | 2014-05-29 |
Family
ID=43822658
Family Applications (2)
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US12/572,548 Expired - Fee Related US8587163B2 (en) | 2009-10-02 | 2009-10-02 | Electric motors and related systems for deployment in a downhole well environment |
US14/082,127 Abandoned US20140144624A1 (en) | 2009-10-02 | 2013-11-16 | Electric motors and related systems for deployment in a downhole well environment |
Family Applications Before (1)
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US12/572,548 Expired - Fee Related US8587163B2 (en) | 2009-10-02 | 2009-10-02 | Electric motors and related systems for deployment in a downhole well environment |
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US (2) | US8587163B2 (en) |
CA (1) | CA2715731A1 (en) |
RU (1) | RU2531224C2 (en) |
Cited By (1)
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US11896545B2 (en) | 2019-05-07 | 2024-02-13 | Therabody, Inc. | Vibrating garment assembly |
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US8587163B2 (en) * | 2009-10-02 | 2013-11-19 | Schlumberger Technology Corporation | Electric motors and related systems for deployment in a downhole well environment |
CA2944552A1 (en) | 2014-04-16 | 2015-10-22 | Nucleus Scientific, Inc. | Magnetic position coupling and valve mechanism |
CA2988383A1 (en) * | 2015-06-05 | 2016-12-08 | Aldan Asanovich Saparqaliyev | Electrical machine & electrical drive |
US9746211B2 (en) | 2015-08-26 | 2017-08-29 | Emerald Energy NW, LLC | Refrigeration system including micro compressor-expander thermal units |
US11002270B2 (en) * | 2016-04-18 | 2021-05-11 | Ingersoll-Rand Industrial U.S., Inc. | Cooling methods for electrically operated diaphragm pumps |
CN105986788B (en) * | 2016-06-24 | 2018-09-04 | 中国石油天然气股份有限公司 | The safety control and method and air of air drive withdrawal well drive injection and extraction system |
WO2018052884A1 (en) | 2016-09-13 | 2018-03-22 | Nucleus Scientific, Inc. | Axial flux motor |
US20200174150A1 (en) * | 2018-11-29 | 2020-06-04 | Baker Hughes, A Ge Company, Llc | Power-efficient transient electromagnetic evaluation system and method |
US11762120B2 (en) | 2018-11-29 | 2023-09-19 | Baker Hughes Holdings Llc | Power-efficient transient electromagnetic evaluation system and method |
US11592018B2 (en) * | 2020-05-22 | 2023-02-28 | Saudi Arabian Oil Company | Surface driven downhole pump system |
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Also Published As
Publication number | Publication date |
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US8587163B2 (en) | 2013-11-19 |
RU2531224C2 (en) | 2014-10-20 |
RU2010140337A (en) | 2012-04-10 |
US20110080060A1 (en) | 2011-04-07 |
CA2715731A1 (en) | 2011-04-02 |
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